You should be able to write the data into existing records in your file. Open a record and write it back out with 0 (or 1) for the length of the record. Then do this for all records.
... Thinkpads_User

I agree that from disk, bits and bites can be recovered, the normal "file delete" will only delete the file pointer in the file system.
so, overwriting the file is the only way to go, the more often you change the contents, the better the security will be.
the important point is: the data you save must be the same size, otherwise the file data might be relocated on disk, so you actually may not overwrite the exact disk parts of where your file was.
so, you may replace the contents first with "only 0 bits", then with "only 1" bits, then with "01" sequences, finally with only "10" sequences.

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